1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2012 Regents of the University of California
 4 * Copyright (C) 2017 SiFive
 5 */
 6
 7#include <linux/clocksource.h>
 8#include <linux/delay.h>
 9#include <asm/sbi.h>
10#include <asm/processor.h>
11
12unsigned long riscv_timebase;
13EXPORT_SYMBOL_GPL(riscv_timebase);
14
15void __init time_init(void)
16{
17	struct device_node *cpu;
18	u32 prop;
19
20	cpu = of_find_node_by_path("/cpus");
21	if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
22		panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
23	of_node_put(cpu);
24	riscv_timebase = prop;
25
26	lpj_fine = riscv_timebase / HZ;
27	timer_probe();
28}